If 2n+1P(n-1) : (2n-1)Pn =3:5,find n...

If 2n+1P(n-1) : (2n-1)Pn =3:5,find n

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If "^(2n+1)P_(n-1):^(2n-1)P_n=3:5, then find the value of n .

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